Comb-Shaped Electrode Design for LCD Response Speed and Light Transmission
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Solution Overview
Problem
Liquid crystal display devices using horizontal electric fields face challenges in improving response speed and reducing light transmission loss due to manufacturing variations in electrode shapes, which affect the rotation of liquid crystal molecules and subsequent light transmittance.
Innovation Solution
The liquid crystal display device features a first and second electrode with comb-shaped portions that protrude from electrode base portions, creating transmission ineffective areas between their front edges, which are not continuously aligned, allowing for a more efficient horizontal electric field generation and improved liquid crystal molecule rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the electrode shape is optimized to improve response speed, then liquid crystal molecule rotation is enhanced, but light transmission loss increases due to manufacturing variations
Solution Approach 1:
The electrode is divided into multiple comb-shaped portions with protrusions and recessions, creating segmented effective areas and transmission ineffective areas. This segmentation allows the electric field to be distributed more uniformly, improving response speed while the non-aligned transmission ineffective areas reduce light transmission loss by preventing continuous alignment of dark regions.
Solution Approach 2:
The comb-shaped electrode portions are designed with asymmetric protrusions and recessions where the transmission ineffective areas are intentionally not continuously aligned. This asymmetric arrangement prevents the formation of continuous dark lines that would cause light transmission loss, while still maintaining the electric field distribution needed for fast response speed.
2Loss of energy
If the electrode shape is modified to reduce light transmission loss, then manufacturing variations are accommodated, but response speed may be affected
Solution Approach 1:
Different regions of the electrode are designed with different properties: the comb-shaped portions create local effective areas for strong electric field generation (fast response), while the transmission ineffective areas are arranged to be non-continuously aligned to minimize light transmission loss. This local quality differentiation resolves the contradiction between response speed and light transmission.
3Ease of operation
If comb-shaped electrode portions are added to improve liquid crystal rotation, then electrode complexity increases, but manufacturing precision requirements are reduced
Solution Approach 1:
The comb-shaped electrode design creates dynamic electric field distribution that adapts to liquid crystal molecule orientation. The multiple protrusions and recessions allow the electric field to dynamically interact with liquid crystal molecules, enhancing rotation efficiency. While the structure is more complex, the manufacturing precision requirements are reduced because the design accommodates manufacturing variations through the non-aligned transmission ineffective areas.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enhances the response speed and reduces light transmission loss by optimizing the alignment and rotation of liquid crystal molecules, thereby improving the display's performance and visual field angle.
Implementation Method 1
a liquid crystal drive system using an electric field generated in a direction parallel (horizontal direction) to a substrate, i.e., a horizontal electric field is known
Implementation Method 2
form an electric field between a first electrode and a second electrode in a direction parallel to a substrate to rotate liquid crystal molecules
Implementation Method 3
a liquid crystal display device of the horizontal electric field type such as a fringe field switching (FFS) type and an in-plane switching (IPS) type is also known
Implementation Method 4
perform a display using a change in light transmittance corresponding to the rotation of the liquid crystal molecules
Data Source
AI summary
According to an aspect, a liquid crystal display device includes a first electrode having a plurality of electrode base portions that extend in a first direction; a plurality of first comb-shaped portions that protrude from each of the plurality of electrode base portions in a second direction; and a plurality of second comb-shaped portions that protrude from each of the plurality of electrode base portions in an opposite direction to the second direction. Front edges of the first comb-shaped portions and the second comb-shaped portions that extend from the adjacent electrode base portions face each other with a gap therebetween, respectively. Transmission ineffective areas are formed at portions between the front edges facing each other, respectively, and not continuously aligned.